probably not true in most other langauges. although I’m not well versed in the way numbers are represented in code and what makes a number “NaN”, something tells me the technical implications of that would be quite bad in a production environment.
the definitive way to check for NaN in JS would probably be something like
// with `num` being an unknown value
// Convert value to a number
const res = Number(num);
/*
* First check if the number is 0, since 0 is a falsy
* value in JS, and if it isn't, `NaN` is the only other
* falsy number value
*/
const isNaN = res !== 0 && !res;
C, because yes.
I’d say C too because that’s the only one that would be True in a normal programming language and this is javascript so…
It’s not true in a normal programming language. If it is true in yours, you should stop using it immediately.
A non type should be a type. It should be of the type none. And it is in good script languages like Python so I don’t know why you think it shouldn’t.
They say a picture is worth a thousand words.
That’s a Numpy type, not a Python typesm, try a=None b=None a==b
That’s not a type. A NaN is a floating point number (of type float). I used numpy because that’s the easiest way to get a NaN.
This is part of the floating point standard.
This was never about None, which is a completely different thing.
probably not true in most other langauges. although I’m not well versed in the way numbers are represented in code and what makes a number “NaN”, something tells me the technical implications of that would be quite bad in a production environment.
the definitive way to check for NaN in JS would probably be something like
// with `num` being an unknown value // Convert value to a number const res = Number(num); /* * First check if the number is 0, since 0 is a falsy * value in JS, and if it isn't, `NaN` is the only other * falsy number value */ const isNaN = res !== 0 && !res;Another way to check whether a number is
NaN:const isNaN = res !== res;As
NaNis the only value out there that is not equal to itself. See my other comment on this post for more: https://programming.dev/comment/17221245This comparison should work in every programming language out there that implements/respects/uses IEEE 754 floating point numbers.
NaN is a special floating point value. https://en.wikipedia.org/wiki/IEEE_754
It’s weird but it makes sense why it was chosen to be this way.
Can’t be C, C is the true path.